115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#ifndef BRPC_JSON2PB_ZERO_COPY_STREAM_WRITER_H
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#define BRPC_JSON2PB_ZERO_COPY_STREAM_WRITER_H
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#include <google/protobuf/io/zero_copy_stream.h> // ZeroCopyOutputStream
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#include <iostream>
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//class IOBufAsZeroCopyOutputStream
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// : public google::protobuf::io::ZeroCopyOutputStream {
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//public:
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// explicit IOBufAsZeroCopyOutputStream(IOBuf*);
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//
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// // Interfaces of ZeroCopyOutputStream
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// bool Next(void** data, int* size);
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// void BackUp(int count);
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// google::protobuf::int64 ByteCount() const;
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//
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//private:
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// IOBuf* _buf;
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// size_t _initial_length;
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//};
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namespace json2pb {
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class ZeroCopyStreamWriter {
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public:
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typedef char Ch;
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ZeroCopyStreamWriter(google::protobuf::io::ZeroCopyOutputStream *stream)
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: _stream(stream), _data(NULL),
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_cursor(NULL), _data_size(0) {
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}
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~ZeroCopyStreamWriter() {
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if (_stream && _data) {
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_stream->BackUp(RemainSize());
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}
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_stream = NULL;
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}
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void Put(char c) {
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if (__builtin_expect(AcquireNextBuf(), 1)) {
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*_cursor = c;
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++_cursor;
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}
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}
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void PutN(char c, size_t n) {
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while (AcquireNextBuf() && n > 0) {
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size_t remain_size = RemainSize();
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size_t to_write = n > remain_size ? remain_size : n;
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memset(_cursor, c, to_write);
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_cursor += to_write;
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n -= to_write;
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}
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}
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void Puts(const char* str, size_t length) {
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while (AcquireNextBuf() && length > 0) {
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size_t remain_size = RemainSize();
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size_t to_write = length > remain_size ? remain_size : length;
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memcpy(_cursor, str, to_write);
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_cursor += to_write;
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str += to_write;
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length -= to_write;
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}
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}
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void Flush() {}
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// TODO: Add BIADU_CHECK
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char Peek() { return 0; }
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char Take() { return 0; }
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size_t Tell() { return 0; }
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char *PutBegin() { return NULL; }
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size_t PutEnd(char *) { return 0; }
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private:
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bool AcquireNextBuf() {
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if (__builtin_expect(!_stream, 0)) {
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return false;
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}
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if (_data == NULL || _cursor == _data + _data_size) {
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if (!_stream->Next((void **)&_data, &_data_size)) {
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return false;
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}
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_cursor = _data;
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}
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return true;
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}
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size_t RemainSize() {
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return _data_size - (_cursor - _data);
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}
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google::protobuf::io::ZeroCopyOutputStream *_stream;
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char *_data;
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char *_cursor;
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int _data_size;
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};
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} // namespace json2pb
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#endif //BRPC_JSON2PB_ZERO_COPY_STREAM_WRITER_H
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